package com.itic.appbase.framework.utils;

import org.apache.commons.lang3.StringUtils;

public class EmojiHelper {
	 /** 
     * 检测是否有emoji字符 
     * 
     * @param source 
     * @return 一旦含有就抛出 
     */  
    public static boolean containsEmoji(String source) {  
        if (StringUtils.isBlank(source)) {  
            return false;  
        }  
        int len = source.length();  
        for (int i = 0; i < len; i++) {  
            char codePoint = source.charAt(i);  
            if (!isNotEmojiCharacter(codePoint)) {  
                //判断到了这里表明，确认有表情字符  
                return true;  
            }  
        }  
        return false;  
    }  
  
    /** 
     * 判断是否为非Emoji字符 
     * 
     * @param codePoint 比较的单个字符 
     * @return 
     */  
    private static boolean isNotEmojiCharacter(char codePoint) {  
        return (codePoint == 0x0) ||  
                (codePoint == 0x9) ||  
                (codePoint == 0xA) ||  
                (codePoint == 0xD) ||  
                ((codePoint >= 0x20) && (codePoint <= 0xD7FF)) ||  
                ((codePoint >= 0xE000) && (codePoint <= 0xFFFD)) ||  
                ((codePoint >= 0x10000) && (codePoint <= 0x10FFFF));  
    }  
  
    /** 
     * 过滤emoji 或者 其他非文字类型的字符 
     * 
     * @param source 
     * @return 
     */  
    public static String filterEmoji(String source) {  
    	
    	if( containsEmoji(source) ){
    		StringBuilder buf = new StringBuilder();  
	        int len = source.length();  
	        for (int i = 0; i < len; i++) {  
	            char codePoint = source.charAt(i);  
	            if (isNotEmojiCharacter(codePoint)) {  
	                buf.append(codePoint);  
	            }  
	        }  
	        source = buf.toString();
    	}
  
        return source;  
    }  
    
}
